add waterVolume as a "proxy" for moisture in soil sensors
prepare for /device/climate/netatmo/rain
initial scafolding for zigbee...

…much more to come
minor touch-up for zigbee
tuesday night edits

- telldus fixes
- upnp/audio driver use paths from UPnP data
- pioneer/receiver - initial push, not ready yet
- tesla/sedan - better sunroof open characterization